I don't think there is a unique serial number system for the Special Offers model. If you got them both delivered at the same time, it might be impossible to tell them apart while they are still sealed in their boxes. If they shipped separately then the invoice should show the SO price difference on one model. Otherwise you might have to take one out of the sealed box to see which model it is by turning it on and looking for the things @DiapDealer mentioned.
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